2015-03-24T09:09:06ZAppliance Signature and Energy Auditing for Sustainability - CityCom Technology Limitedhttp://dspace.cityu.edu.hk:80/handle/2031/7087
Title: Appliance Signature and Energy Auditing for Sustainability - CityCom Technology Limited
Authors: Chui, Kwok Tai (徐國泰)
Abstract: ﻿Sustainability, energy conservation and demand response have become an inevitable concern around the world. This project proposes a sustainable and all-round system which consists of three partitions, advanced metering infrastructure, energy auditing and appliance signature. Advanced metering infrastructure in smart grid composes of hundreds of smart meter which collect total energy consumption of each apartment to the utilities through wireless communication. It is first of its kind that a WiFi and ZigBee building area network of advanced metering infrastructure is designed to overcome the signal obstruction and heavy traffic loading inside the complex structure of building. An understanding of the specific load profile will intensively increase the energy saving awareness and strategy of end users. Thus, the proposed system has incorporated the sub-metering for energy auditing. For the development of energy auditing, ZigBee is utilized to cater for communication between the central server and automated sockets or light switches. The measurement of data is achieved by current transformers. The central server analyses the energy consumption of electric appliances (together with the household working hours) and generates the load profile. Local users can reduce the time of use of appliances with high electricity footprint in a judicious manner based on the load profile. Appliance signature is accompanied by energy auditing which classifies the type of end-user appliances without a prior knowledge. Multi-class support vector machine is newly employed for appliance signature with characteristics of a maximum margin classification with accuracy of 95%. It has improvement accuracy by 40.5% compared to traditional K-means algorithm. This provides an evidence for utilities in energy management according to the energy usage pattern. Based on this project, one journal paper has been published and two conference papers have been accepted. Also, the 2-Runners Up was awarded in the paper award competition organised by the HKIE CAD.
Notes: Nominated as OAPS (Outstanding Academic Papers by Students) paper by Department in 2013-14.; This paper is under embargo at City University of Hong Kong until March 2015.2013-01-01T00:00:00ZWeb enabled data logger for photovoltaic inverter (I)http://dspace.cityu.edu.hk:80/handle/2031/7065
Title: Web enabled data logger for photovoltaic inverter (I)
Authors: Cheng, Chun Sing (鄭晉昇)
Abstract: ﻿In this era of industrial development and population rapid growing, the demand for energy has an enormous increase. However, largest energy sources like coal, petro and natural gas are limited and will run out in next century. To overcome this energy crisis, renewable energy could be an important issue for research.
Among different types of renewable energy, solar energy is easily installed and has less restriction such as space and district. Nevertheless, efficient power conversion in photovoltaic system needs some improvements by data analysis. In this project, we implement a data logger for photovoltaic system, in which data are stored in memory card and forwarded to web server and hence providing a portable monitoring system to user.
The data logger is constructed by a core-board with self-design console board and a web-based board. Lots of communication protocols like SPI, RS232 and RS485 are applied to communicate with different integrated-circuit devices and photovoltaic. By using point-to-point wireless modulator on each board, data can be transmitted from data logger to web server and displayed simultaneously. In order to provide an online monitoring web site, Linux OS should be implemented in web-based board for controlling TCP/IP services.
Notes: Nominated as OAPS (Outstanding Academic Papers by Students) paper by Department in 2013-14.2013-01-01T00:00:00ZQuadrotor Helicopter 3http://dspace.cityu.edu.hk:80/handle/2031/7066
Title: Quadrotor Helicopter 3
Authors: Yu, Wing Lung (余泳龍)
Abstract: ﻿In this final year project, we aim to build an Android based Quadrotor Helicopter.
Quadrotor Helicopter has invented for many years. The function is widely used in research and entertainment. In our project, these functions are also implemented like video streaming. The Quadrotor Helicopter can be dividing into two parts. One is hardware and another one is software.
In hardware part, a Quadrotor Helicopter frame is designed. Also, the frame is contained four motor, four motor drivers and a control board which contains different functions like a WIFI antenna and a camera.
In software part, Android OS is embedded into the system. The jobs of OS is to communicate with another Android device through WIFI signal. The user can make a command through this device to the Quadrotor. Also, the Quadrotor system also contains another Microcontroller Unit which mainly receiving the sensors signals and controling the motor movement.
Although there are many Quadrotor product sold in many model shop, we tried our best to build all parts in Quadrotor by ourselves. My main works in this project are to develop the hardware related to whole system of Quadrotor and a Printed Circuit Board (PCB) for controlling. Also, I need to implement the Quadrotor by using Proportional Integral Derivative (PID) to control the Quadrotor.
Flying is our dream.
Notes: Nominated as OAPS (Outstanding Academic Papers by Students) paper by Department in 2013-14.2013-01-01T00:00:00Z60 GHz Antennas for WiGig/802.11adhttp://dspace.cityu.edu.hk:80/handle/2031/7021
Title: 60 GHz Antennas for WiGig/802.11ad
Authors: Leung, Sut Yee (梁實怡)
Abstract: ﻿This project is an attempt to develop an antenna with a center frequency at 60 GHz and a
bandwidth of 7 GHz for the WiGig 802.11ad applications. The proposed antenna is a circular
vertical patch antenna (VPA) with two layers of Duroid 5880 as substrates. An air cavity is
embedded in the lower substrate for gain enhancement. The antenna is fed by microstrip
transmission line placed on the top of the upper substrate. Measurement results show the
antenna obtains an impedance bandwidth of 15 GHz (25%) from 51.5 GHz to 66.5 GHz; and
yields a gain of 8.3 dBi at 60 GHz. Radiation patterns at 55 GHz, 60 GHz and 65 GHz were
measured. The antenna satisfies the requirements for the 802.11 ad applications.
Notes: Nominated as OAPS (Outstanding Academic Papers by Students) paper by Department in 2013-14.2013-01-01T00:00:00Z